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United States Patent | 6,252,711 |
Damask ,   et al. | June 26, 2001 |
A birefringent filter includes an input optical apparatus for receiving an input optical beam and producing therefrom parallel first and second optical beams offset in a first direction and having the same polarization. A birefringent filter unit receives the first and second polarized optical beams and produces a first and second elliptically polarized optical beams. An output optical apparatus combines predetermined components of the first and second elliptically polarized optical beams to form a first and second elliptical polarized output beams. The two output beams have intensities that vary inversely, in a periodic manner, as a function of frequency of the input optical beam.
Inventors: | Damask; Jay N. (Annapolis, MD); Doerr; Christopher Richard (Middletown Township, NJ) |
Assignee: | Lucent Technologies, Inc (Murray Hill, NJ) |
Appl. No.: | 532143 |
Filed: | March 21, 2000 |
Current U.S. Class: | 359/498; 359/495; 359/497; 359/900; 398/9 |
Intern'l Class: | G02B 027/28; H04J 014/00 |
Field of Search: | 359/494,495,496,497,498,122,124,127,129,115 385/11 |
4973124 | Nov., 1990 | Kaede | 359/127. |
4987567 | Jan., 1991 | Buhrer | 359/498. |
5606439 | Feb., 1997 | Wu | 385/31. |
5867291 | Feb., 1999 | Wu et al. | 359/124. |
5912748 | Jun., 1999 | Wu et al. | 359/117. |
6163393 | Dec., 2000 | Wu et al. | 359/127. |